Solid-State29Si NMR Analysis of Cements:  Comparing Different Methods of Relaxation Analysis for Determining Spin−Lattice Relaxation Times to Enable Determination of the C3S/C2S Ratio

2007 ◽  
Vol 46 (15) ◽  
pp. 5122-5130 ◽  
Author(s):  
Christopher L. Edwards ◽  
Lawrence B. Alemany ◽  
Andrew R. Barron
Keyword(s):  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Nmr Analysis ◽  
Relaxation Analysis ◽  
Spin Lattice

A Selective Determination of the Proton Nuclear Relaxation Times of the Alkaloid Vindoline: An Extension via Fourier Transform Measurements

1974 ◽  
Vol 52 (5) ◽  
pp. 829-832 ◽  
Author(s):  
L. D. Hall ◽  
Caroline M. Preston
Keyword(s):  
Fourier Transform ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Nuclear Relaxation ◽  
Transform Method ◽  
Fourier Transform Method ◽  
Selective Determination ◽  
Spin Lattice

A Fourier Transform method has been used to measure the spin–lattice relaxation times of essentially all the protons of the alkaloid, vindoline. It is shown that even for a molecule of this size substantial and potentially useful differences exist in the experimental relaxation times which reflect the degree of crowding of each proton by other protons.

The determination of zero-field splittings from measurements of spin-lattice relaxation times

1974 ◽  
Vol 35 (5) ◽  
pp. 73-76 ◽  
Author(s):  
A.M. Vasson ◽  
A. Vasson ◽  
A. Gavaix ◽  
T.S. Yalcin ◽  
P. Steggles ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Zero Field ◽  
Spin Lattice

ChemInform Abstract: DETERMINATION OF ANISOTROPY OF MOLECULAR MOTION WITH (13)C SPIN-LATTICE RELAXATION TIMES

1975 ◽  
Vol 6 (24) ◽  
Author(s):  
STEFAN BERGER ◽  
FRITZ R. KREISSL ◽  
DAVID M. GRANT ◽  
JOHN D. ROBERTS
Keyword(s):  
Molecular Motion ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

Determination of anisotropy of molecular motion with carbon-13 spin-lattice relaxation times

1975 ◽  
Vol 97 (7) ◽  
pp. 1805-1808 ◽  
Author(s):  
Stefan Berger ◽  
Fritz R. Kreissl ◽  
David M. Grant ◽  
John D. Roberts
Keyword(s):  
Molecular Motion ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

Sequence determination of peptides by measurements of proton spin lattice relaxation times

1977 ◽  
Vol 78 (1) ◽  
pp. 276-278 ◽  
Author(s):  
J.Howard Bradbury ◽  
Brian Warren
Keyword(s):  
Relaxation Times ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Sequence Determination ◽  
Spin Lattice

Tone-Bursting of Quadrupolar Nuclei. Determination of the Spin–Lattice Relaxation Times in Ferroelectric Lithium Tantalate and Lithium Niobate

1972 ◽  
Vol 50 (10) ◽  
pp. 966-975 ◽  
Author(s):  
J. D. Stroud ◽  
R. B. Creel ◽  
S. L. Segel ◽  
R. J. Schoenberger
Keyword(s):  
Lithium Niobate ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Electric Quadrupole ◽  
Lithium Tantalate ◽  
Spin Lattice Relaxation ◽  
Quadrupolar Nuclei ◽  
Quadrupole Relaxation ◽  
Spin Lattice

The technique of "tone-bursting" for the determination of spin–lattice relaxation times has been extended to quadrupolar nuclei and applied to two ferroelectric crystals: lithium tantalate and lithium niobate. The approach has been to analytically follow the populations of the Zeeman quadrupole levels through each passage through resonance and determine the effective T1 from the decrease in magnetization. The analytic results agree with the computer results obtained by Creel and Barnes. The results also agree with the conclusion of Walstedt that the relaxation rate is enhanced by a factor of [Formula: see text] when only the central resonance is being irradiated in a quadrupolar split pattern.Application of the technique to 7LiTaO3 yields a value of 3.0 ± 1.0 s for the effective T1, dominated by magnetic dipole relaxation. For 7LiNbO3, the effective T1 is 33 ± 5.0 s for the central transition and the relaxation mechanism is predominantly electric quadrupole relaxation.

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